SEMTECH SC603

SC603 CHARGE PUMP REGULATOR WITH SELECTABLE 5.0V/4.5V OUTPUT POWER MANAGEMENT Description Features ‹ Small size - MLP Micro 10 lead 3x3mm package The SC603 is a versatile charge pump designed for use ‹ Selectable 5.0V or 4.5V output voltage in battery operated power supply applications. The wide ‹ 200mA available with 4.5V output input range is matched for Li-Ion battery applications. ‹ 160mA available with 5.0V output Only two tiny ceramic bucket capacitors are required, and ‹ Short circuit protection the inductorless implementation provides a reduced-EMI ‹ Soft Start function solution. Low noise mode switching circuitry and con- ‹ Shutdown current <2µA stant output current allow the use of extremely small ‹ Selectable fixed frequencies of 262kHz & 650kHz input and output capacitors. ‹ Low ripple ‹ Regulated to +/-5% The SC603 charge pump regulator can be used for ap- ‹ Ease of use plications that require up to 200mA of output current with a 4.5V output. The 5.0V output version provides up Applications to 160mA of output current. ‹ Cellular phones ‹ LED photo flash for cellular phones Compared to a switch mode regulator, the SC603 offers ‹ LED backlighting a solution with less cost, area, noise and complexity. ‹ PDA power supplies ‹ Portable electronics ‹ Electronic books ‹ Wireless web appliances Typical Application Circuit U1 1 3 2.7V to 6.5V VIN VOUT 4.5V or 5.0V 2 Cin Cout CF1+ 1.0uF 6 1.0uF Cbucket1 EN 1.0uF 9 CF1- UP TO 10 LEDS 4 FSEL 10 CF2+ Cbucket2 5 1.0uF VSEL 7 CF2- GND 8 November 2, 2004 1 www.semtech.com SC603 SC603 POWER MANAGEMENT Absolute Maximum Ratings Pl arameter Sm ymboMs aximu Unit SV upply Voltage -V 0.3 to +7.0 IN OV utput Voltage -V 0.3 to +7.0 OUT VSC hort Circuit DurationSe Indefinit OUT Thermal Resistance, Junction To Ambient θ 3W 1 °C/ JA (JESD51 Standard Method) OT perating Ambient -C 40 to +85 ° A JT unction Temperature Range -C 40 to +150 ° JC ST torage Temperature Range -C 65 to +150 ° STG Peak IR Reflow Temperature T 2C 40 ° LEAD SC603IMLTR Peak IR Reflow Temperature T 2C 60 ° LEAD SC603IMLTRT Electrical Characteristics Unless specified: T = -40°C to 85°C, C =C = 1.0µF (ESR = 0.1Ω), C =1.0µF (ESR = 0.1Ω), V = 2.85V to 5.5V A IN BUCKET OUT IN Pl arameter Ss ymbo CN ondition MP I TX Y Ms A Unit IV nput Supply Voltage 25 .5 6V . IN QI uiescent Current Freq. = 262kHz, I = 0mA, V=0 3.7V 14 . 1A . m Q OUT IN Freq. =650kHz, I = 0mA, V=1 3.7V 28 . 2A . m OUT IN E2 nable = 0 µA OV utput Voltage Static Load Regulation with 40 .75 55 . 5V .2 OUT VSEL = 1 Static Load Regulation with 45 .27545 . 4V .72 VSEL = 0 OI utput Current VSEL = 1, 3.2V < V<0 5.5V 1A 5 m OUT IN VSEL = 1, 3.2V < V < 5.5V 1A 60 m IN o o T = -40 C to 70 C A VSEL = 0, 3.2V < V<0 5.5V 1A 9 m IN VSEL = 0, 3.2V < V < 5.5V 2A 00 m IN o o T = -40 C to 70 C A VSEL=1, 2.85V < V<0 5.5V 6A m IN VSEL=0, 2.85V < V<0 5.5V 1A 2 m IN  2004 Semtech Corp. 2 www.semtech.com SC603 POWER MANAGEMENT Unless specified: T = -40°C to 85°C, C =C = 1.0µF (ESR = 0.1Ω), C =1.0µF (ESR = 0.1Ω), V = 2.85V to 5.5V A IN BUCKET OUT IN Pl arameter Ss ymbo CN ondition MP I TX Y Ms A Unit Pump Frequency E% nable = 1, FSEL= 0 -2 15 2% 6 +z 15 kH f PUMP E% nable = 1, FSEL = 1 -0 20 6% 5 +z 20 kH Frequency Mode Transition Time Transition time from one frequency T mode to any other frequency mode 1d Perio CLOCK guaranteed by design SI hort Circuit Current V =0V, I = I 6A 00 m SC OUT OUT IN IV nput High Threshold A3 ll input pins (Enable, VSEL, FSEL)1V . IH IV nput Low ThresholdA4 ll input pins (Enable, VSEL, FSEL) 0V . IL II nput High CurrentA0 ll input pins (Enable, VSEL, FSEL) 1A µ IH II nput Low Current A0 ll input pins (Enable, VSEL, FSEL) 1A µ IL Power Efficiency from Battery to V = 3.3V, V = 5.0V, I = 60mA IN OUT OUT 7% 5.0 Regulated Charge Pump Output Freq.=262kHz η V = 3.3V, V = 5.0V, I = 60mA IN OUT OUT 7% 4.5 Freq.=650kHz (1), (2) OV utput Ripple Voltage freq = 262kHz, I = 60mA 25 5 4V m PP OUT Note: (1) Peak to peak output ripple voltage with C =C =1µF and X5R dielectric OUT BUCKET (2) Guaranteed by design (3) This device is ESD sensitive. Use of standard ESD handling precautions is required.  2004 Semtech Corp. 3 www.semtech.com SC603 POWER MANAGEMENT Pin Configuration Ordering Information (1) TOP VIEW DE EVICE PACKAG (2) 1 VOUT 10 CF2+ SC603IMLTRT MLP-10 3x3mm CF1+ 2 9 CF1- Sm C603IMLTR MLP-10 3x3m 3 8 VIN GND Sd C603EVB Evaluation Boar 7 4 CF2- FSEL T 5 6 Note: VSEL EN (1) Available in tape and reel only. A reel contains 3000 devices. (2) Lead free product. MLP10: 3X3 10 LEAD Pin Descriptions Pe in Pn in Nam Pin Functio 1TVV OU Output voltage regulated to 5.0V or 4.5 2+C1 F1 Positive terminal of bucket capacitor 3NVV I Input voltage ranging from 2.5V to 6.5 Logic input for selecting the operational frequency. FSEL= 0, freq = 262kHz; 4L FSE FSEL= 1, freq = 650kHz Logic input for selecting the output voltage. VSEL = 1, VOUT = 5V; VSEL = 0, 5L VSE VOUT = 4.5V 6N E Active high enable. Bias current is less than 2uA when set low. 7-C2 F2 Negative terminal of bucket capacitor 8DGd N Groun 9-C1 F1 Negative terminal of bucket capacitor 1+ 0C2 F2 Positive terminal of bucket capacitor Pad for heat sinking purposes. Connect to ground plane using multiple vias. Not Td Thermal Pa connected internally. Block Diagram 3 VIN SWITCH BLOCK 1 VOUT DRIVERS EN 650kHz or 262kHz MODE EN 6 SELECT OSC 2 CF1+ 4 FSEL 9 CF1- COMPARATORS VIN VOUT 10 CF2+ VREF 5 VSEL 7 CF2- TIMER 8 GND VIN 5.0V or 4.5V  2004 Semtech Corp. 4 www.semtech.com SC603 POWER MANAGEMENT Applications Information Frequency Selection Charge Pump Function for Low Ripple The FSEL input is for frequency selection. A logic High level at this input will set the clock frequency to 650kHz, The SC603 uses a voltage doubler circuit which is imple- mented with two switched or ‘bucket’ capactors. Most while a logic Low sets the clock to 262kHz. Input from a charge pump doublers use only one bucket capacitor. µP or other device may be used to change the charge Two bucket capacitors switching on alternate phases pump frequency at any time. The optimal frequency will greatly reduce the output ripple voltage. depend upon the capacitor values, the load current, and the exceptable amount of output ripple. Over-Voltage Protection for Low Voltage Capacitors The output is prevented from exceeding 6.0V. This fea- Ripple Performance ture allows the use of 6.3V ceramic capacitors. Examples of the output ripple, charge pump frequency and capacitor size are listed in Table 2 Ripple Perfor- mance. Comparison with Other Regulation Methods In many instances, a charge pump regulator is the best choice for portable power applications. These regula- Efficiency tors offer many advantages over switch mode regula- Efficiency for the SC603 is defined as, tors. A smaller bill of materials, less layout area, lower component height, less noise, no EMF, and less overall V ⋅I O O η = circuit cost are typical reasons to use this type of regula- ⋅ 2I⋅ + I V() IN O Q tion. The efficiency of a charge pump regulator often approaches and in some cases exceeds the efficiency of a switch mode regulator. where V = output voltage O I = output current O V = input voltage Inductors are often the largest and most expensive dis- IN crete component in a design. There are no inductors I = quiescent current [from Electrical Charac- Q used in the SC603, so the inductor’s cost and layout teristics on page 2] area are eliminated. The noise and EMF associated with the inductor are also eliminated. The SC603’s fixed frequency harmonics are an advan- tage in portable communications equipment, such as cellular telephones. The SC603 has distinct frequen- cies of operation, so the harmonics are predictable. The harmonics are not fixed in a switch mode regulator. Switch mode regulators have harmonics which vary due to the pulse width modulation used to regulate the out- put. Varying harmonics can be a problem because it may be more difficult to ensure acceptable noise perfor- mance over the entire operating range. Many switch mode regulators have increased voltage ripple on the output during pulse skipping mode due to the fact that there are large periods of time when no current is supplied to the output. The SC603 supplies current to the output continuously, so the voltage ripple is less than a switch mode regulator, even with greatly reduced output capacitance.  2004 Semtech Corp. 5 www.semtech.com SC603 POWER MANAGEMENT Table 2 -Ripple Performance Ouput Ripple [mVp-p] V F] req. [kHz] Iout [mA C[C uF] [uF] OUT OUT BUCKET 20 6215 0 21 1 60 5015 0 11 1 5.0V 20 6210 5 51 1 60 5015 5 21 1 20 6215 0 21 1 60 5015 0 11 1 4.5V 20 6220 0 61 1 60 5020 0 31 1 Calculating Power Dissipation Suggested Capacitors The power dissipated by the SC603 is calculated as, Table 3 is a short list of some of the manufacturers and types of multilayer ceramic capacitors that are suggested = P − P P for the SC603. IN OUT D P V ⋅ 2⋅I + I − V ⋅I D ( ) IN O Q O O = Short Circuit and Over Temperature Protection The output is current limited to 600mA to protect against short circuit conditions. Over temperature protection is also provided. Design and Layout Considerations The layout should be patterned after the evaluation board gerber plots shown on page 10. The center pad “ther- mal slug” is not internally connected to ground, but is connected to ground in the layout through a via centered on the pad and connecting to the ground plane. Pin 8 is then routed directly to the center pad. A good ground plane connection is important to make effective use of the low thermal resistance of the MLP package. Table 3 -Suggested Capacitors Voltage Mr anufacturerP] art NumbeCe apacitance[uFDe ielectric Typ EIA Package Siz Rating AK VX 00 805ZC105 1R . X5 7 0V 80 10 PK anasonicE0 CJ1VB0J105 1R . X2 5 0V 40 6.3 T5 DK C0 1608X5R1A10 1R . X3 5 0V 60 10 TZ DK C0 1202Y5V1A106 1R . X5 5 0V 80 10  2004 Semtech Corp. 6 www.semtech.com SC603 POWER MANAGEMENT Typical Characteristics Efficiency vs. Input Voltage Efficiency vs. Load Current Efficiency vs. Load Efficiency vs. Line Voltage 80.0% 85.0% 80.0% 70.0% 75.0% 60.0% 70.0% 50.0% 5V Output, 3.8V Input 65.0% 5V Output, 3.2V Input 40.0% 5V, 150mA Output 4.5V Output, 3.8V Input 4.5V, 200mA Output 4.5V Output, 3.2V Input 60.0% 30.0% 55.0% 20.0% 50.0% 10.0% 45.0% 0.0% 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 40.0% 3.000 3.200 3.400 3.600 3.800 4.000 4.200 Load Current [mA] Load Regulation Line Regulation Load Regulation Line Regulation 5.000 5.000 4.900 4.900 4.800 4.800 4.700 4.700 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V, 150mA Output 5V Output, 3.2V Input 4.600 4.5V, 200mA Output 4.5V Output, 3.2V Input 4.600 4.500 4.500 4.400 4.400 4.300 4.300 4.200 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 3.000 3.500 4.000 4.500 5.000 5.500 6.000 Load Current [mA] Input Voltage [V]  2004 Semtech Corp. 7 www.semtech.com Output Voltage [V] Output Voltage [V] Efficiency [%] SC603 POWER MANAGEMENT Ripple for 150mA, 5V Output Quiescent Current Quiescent Currrent 2.500 2.300 2.100 1.900 1.700 Vo=4.5, 262kHz Vo=5.0V, 262kHz 1.500 Vo=4.5V, 650kHz 1.300 Vo=5.0V, 650kHz 1.100 0.900 0.700 0.500 2.700 3.200 3.700 4.200 4.700 5.200 Input Voltage [V] Startup Conditions for 4.5V Output Startup Conditions for 5.0V Output 100Hz PWM for 5.0V Application 100Hz PWM for 4.5V Application  2004 Semtech Corp. 8 www.semtech.com Quiescent Current [mA] SC603 POWER MANAGEMENT Evaluation Board Schematic Evaluation Board Schematic The evaluation board has a monostable multivibrator cir- cuit to provide a pulse for demonstrating the flash circuit function. Remove jumpers JP4 and JP5 to disable the timing circuit when not in use to save battery current used by R11 through the 555 IC. To adjust the pulse on- time, adjust potentiometer R11. To activate the flash circuit, depress switch S1.  2004 Semtech Corp. 9 www.semtech.com SC603 POWER MANAGEMENT Evaluation Board Bill of Materials Reference Reference Reference Reference Reference Value Value Value Value Value Comment Comment Comment Comment Comment U1 SC603 MLP -Micro 10 lead 3x3mm. C1, C2, C3, C4 1.0uF Ceramic, low ESR type, voltage of 6.3V rating is acceptable for all capacitors. C5 10uF This extra capacitor supports usage of long power leads from a benchtop supply. R1 through R10 - Add limiting resistors to meet the requirements of the application on 0805 pads. D1 through D10 - Add white or blue LEDs to meet the requirements of the application on 1206 pads. Evaluation Board Gerber Plots Top View Bottom View Marking Information Top Marking 603 yyww yyww = Datecode (Example: 0452)  2004 Semtech Corp. 10 www.semtech.com SC603 POWER MANAGEMENT Outline Drawing - MLP-10 DIMENSIONS A E B INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - A .031 .039 0.80 1.00 - - A1 .000 .002 0.00 0.05 - (.008) - - (0.20) - A2 b .007 .009 .011 0.18 0.23 0.30 E C .074 .079 .083 1.87 2.02 2.12 D .042 .048 .052 1.06 1.21 1.31 PIN 1 E .114 .118 .122 2.90 3.00 3.10 INDICATOR e .020 BSC 0.50 BSC (LASER MARK) L .012 .016 .020 0.30 0.40 0.50 N 10 10 aaa .003 0.08 bbb .004 0.10 A SEATING PLANE aaa C A1 C A2 C Land Pattern- MLP-Micro 10 1 2 LxN D N bxN e bbb C A B NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS. Contact Information  2004 Semtech Corp. 11 www.semtech.com SC603 POWER MANAGEMENT Land Pattern - MLP-10 K DIMENSIONS DIM INCHES MILLIMETERS (.112) (2.85) C G .075 1.90 H H .055 1.40 (C) G Z K .087 2.20 P .020 0.50 X .012 0.30 Y Y .037 0.95 X Z .150 3.80 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804  2004 Semtech Corp. 12 www.semtech.com